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Measuring Digital Communications Signals
Spectrum Emission Mask Measurements
Spectrum Emission Mask Measurements
This section explains how to make the spectrum emission mask measurement on a
W-CDMA (3GPP) mobile station. (A signal generator is used to simulate a mobile
station.) SEM compares the total power level within the defined carrier bandwidth
and the given offset channels on both sides of the carrier frequency, to levels allowed
by the standard. Results of the measurement of each offset segment can be viewed
separately.
Step Action Notes
1 Set up the signal source. a. Setup a W-CDMA uplink
signal.
b. Set the source frequency to
1,920 MHz (Channel.
Number: 5 × 1,920 = 9,600).
c. Set the source amplitudes
to 0 dBm.
2 Connect the source RF
OUTPUT to the analyzer
RF INPUT as shown.
3 Select the mode. • Press Mode, Spectrum
Analyzer.
4 Preset the analyzer. • Press Mode Preset.
5 Set the radio standard
and toggle the device to
mobile station.
• Press Mode Setup, Radio
Std, 3GPP W-CDMA,
3GPP W-CDMA, Device
(MS).
6 Set the center frequency. • Press FREQ Channel,
1.920, GHz.
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